Consider this program that I pulled off the web and was posted in 1999. It purports to illustrate how one might produce a transparency.
#!/usr/bin/python # see http://mail.python.org/pipermail/python-list/1999-May/003388.html from Tkinter import * import Image, ImageTk import tkFileDialog class Transparency: def __init__(self, parent): self.canvas = Canvas(parent, bg='green') self.canvas.pack() b = Button(parent, command=self.open, text="Select graphics file") b.pack() def open(self): self.canvas.delete(ALL) filename = tkFileDialog.askopenfilename() if filename != '': im = Image.open(filename) if im.mode != "RGBA": im = Image.open(filename).convert("RGBA") source = im.split() R, G, B, A = 0, 1, 2, 3 mask = im.point(lambda i: i > 0 and 255) # use black as transparent source[A].paste(mask) im = Image.merge(im.mode, source) # build a new multiband image self.graphic = ImageTk.PhotoImage(image=im) self.canvas.create_image(100, 100, image=self.graphic) if __name__ == "__main__": root = Tk() test = Transparency(root) root.mainloop() It colors the canvas green, and produces a black background. An image is merged with the background. I tried out the program. It executes, but I do not see where the transparency is apparent. I used a gif with a picture of a telescope on a white background, and the result is what I would see if I pasted the telescope and white background onto the green canvas. If there's something missing in my observation, I'd like to know what it is. -- Wayne Watson (Watson Adventures, Prop., Nevada City, CA) (121.01 Deg. W, 39.26 Deg. N) GMT-8 hr std. time)**** "Less than all cannot satisfy Man." -- William Blake _______________________________________________ Image-SIG maillist - Image-SIG@python.org http://mail.python.org/mailman/listinfo/image-sig
